Technical and environmental assessment of hydrothermally synthesized foshagite and tobermorite-like crystals as fibrillar C-S-H seeds in cementitious materials

Somayeh Nassiria Civil & Environmental Engineering Department, Washington State University, University of California Davis, Davis, CA, USACorrespondence[email protected]

https://orcid.org/0000-0001-5367-2167

Ananya Markandeyab Civil & Environmental Engineering Department, Washington State University, Pullman, WA, USA

Md Mostofa Haiderb Civil & Environmental Engineering Department, Washington State University, Pullman, WA, USA

Antonio Valenciac School of Mechanical and Materials Engineering, Washington State University, Pullman, WA, USA

Milena Rangelovd Engineering & Software Consultants, LLC, Washington, DC, USA

Hui Lie Composite Materials and Engineering Center, Washington State University, Pullman, WA, USA

Aaron Halstedf Pacific Nano Products, Inc., Renton, WA, USA

David Bollingerg Voiland College of Engineering and Architecture, Washington State University, Pullman, WA, USA

John McCloyh School of Mechanical and Materials Engineering, Institute of Materials Research, Washington State University, Pullman, WA, USA

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Abstract

This study evaluates two calcium-silicate-hydrate (C-S-H) nanoseeds: tobermorite (TOB) and foshagite (FOS), for accelerating hydration and strength gain in cement systems. TOB and FOS seeding at 1.5%wt generated 7 and 3 times more heat of hydration than the control at hour four. In addition, 1.5%wt TOB and 1%wt FOS seeding increased 1- and 3-day compressive strength (f_c) by 40 and 30% and flexural strength (f_f) by 20 and 23%. Twenty-eight-day f_c and f_f increased by up 30 and 17% with 1.5%wt TOB. The contribution of C-S-H seeds to the total global warming potential of seeded mortars was 9–15% and down to 2–5% using recycled steam. After the improvements in 28-day f_c were factored in, the carbon intensity index of seeded mortars was lower than the control by up to 20%. Based on these initial results, the studied hydrothermally synthesized C-S-H seeds appear sensible from the strength development and environmental stances.

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Technical and environmental assessment of hydrothermally synthesized foshagite and tobermorite-like crystals as fibrillar C-S-H seeds in cementitious materials

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Technical and environmental assessment of hydrothermally synthesized foshagite and tobermorite-like crystals as fibrillar C-S-H seeds in cementitious materials

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